I have a sensor (EFS-10) with an impedance that changes according to the relative humidity in the air (datasheet). The sensor needs a small AC voltage (1V) with a frequency of 1 kHz.
I am planning to use a function generator to generate a 0-2V square wave with a frequency and create an AC voltage with an AC coupling, see attached image.
What is the best way to measure the impedance of the sensor? I was thinking about a voltage divider and a full wave precision rectifier, but in that case the voltage over the sensor will vary (do not know if that is an issue). Are there other or better techniques that can be used to measure the impedance accurately?